jQuery modal form dialog postback problems
Be aware that there is an additional setting in jQuery UI v1.10. There is an appendTo setting that has been added, to address the ASP.NET workaround you're using to re-add the element to the form.
Try:
$("#dialog").dialog({ autoOpen: false, height: 280, width: 440, modal: true, appendTo:"form" });
"AppendTo" option works to me.
$("#dialog").dialog({ ..., appendTo:"form" });